Updated Xtensa support (#525)

* Add LX8 support for > 32 interrupts

Also fix inconsistent SWPRI define in interrupt handler

* ThreadX: Fix context switch logic

- Disable interrupts prior to allocating a large exception frame;
  only reenable them after deallocating the extra memory.
- Any user tasks with stacks based on TX_MINIMUM_STACK do not
  have sufficient space for both a context switch frame and an ISR
  frame; ill-timed interrupts were causing stack overruns.

* ThreadX: Interrupt fixes for TX_ENABLE_EXECUTION_CHANGE_NOTIFY

- Must reload register trashed by notify hook function call
- Must ensure PS.WOE is set before using call8
- Remove unused XT_USE_INT_WRAPPER define and associated changes,
  which had a bug in XEA2 usage
- Fix another case where enabling the thread notify hooks for
  call0 ABI corrupted a register

* ThreadX: Support for __DYNAMIC_REENT__

- ThreadX change to handle dynamic reent for both newlib and xclib
- Adapt ThreadX xclib interface code to handle dynamic reent pointers

* ThreadX: Xtensa execution profiling support

- Update upstream execution profiling for Xtensa port

* ThreadX: Update xtensa port readme

* ThreadX: Add Xtensa example to EPK

- tx_execution_profile.h now defines an Xtensa example
  in addition to the existing Cortex example

* ThreadX: Add xtensa.cmake

* ThreadX: Update XSHAL_CLIB ifdefs in __getreent()

- Prevent a fall-through with no return value when neither
  xclib nor newlib are used.

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